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作者机构:Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy New York 12180 USA Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA
出 版 物:《International Journal of High Speed Electronics and Systems》
年 卷 期:2007年第17卷第1期
页 面:19-23页
学科分类:0809[工学-电子科学与技术(可授工学、理学学位)] 08[工学]
主 题:Gallium Nitride heterojunction field-effect transistor cutoff frequency
摘 要:We report on two-dimensional isothermal simulations of recessed gate and field-plated AlGaN - GaN HFETs with submicron gates. The optimization of the recessed gate shape allows us to reduce the electric field at the drain-side gate edge by approximately 30%. Our simulations reveal a dramatic increase of the effective gate length with increasing drain-to-source bias with a commensurate decrease of the cutoff frequency (up to 40% decrease for 50V). To improve the cutoff frequency for the high drain-to-source bias, we suggest using the second field plate connected to the drain with a small gap between the two field plates. In this design, the electric field in the gap between the gate and the drain field plate is higher leading to a significant reduction of the effective gate length and, as a consequence, to an increase in the cutoff frequency at high drain-to-source biases (compared to the conventional design).